关于设置IOS不支付问题

app.js

ios: function(){
    var that = this;
    wx.getSystemInfo({
      success:function(res){
       console.log(res)       
        if(res.platform == "devtools"){
          that.globalData.is_ios=false
        }else if(res.platform == "ios"){
        }else if(res.platform == "android"){
          that.globalData.is_ios=false
        }
      }
    })
  },

onLaunch: function() {
  this.ios()      
}

wxjs:

tocharge: function () {
    if(app.globalData.is_ios){
      wx.showModal({
        title: '应IOS平台规范对小程序的要求，IOS用户暂时无法使用该功能。',
      })
    }else{
      wx.navigateTo({
        url: '/pages/newPage/drawMon/index',
      })
    }
    
  },

wxml:

<view class='padding_x30' catchtap='tocharge'>
  <view class='mon_ flex_ padding_x30 padding_y40'>
    <image src='/image/mine/mon.png' mode='widthFix'></image>
    <text class='flex_1 padding_x30'>充值送积分</text>
    <button hover-class='none'>去充值</button>
  </view>
</view>